US2010238414A1PendingUtilityA1

Visual display device

39
Assignee: TOGINO TAKAYOSHIPriority: Mar 23, 2009Filed: Mar 19, 2010Published: Sep 23, 2010
Est. expiryMar 23, 2029(~2.7 yrs left)· nominal 20-yr term from priority
Inventors:Takayoshi Togino
G02B 27/0101G02B 5/0278G02B 3/08G02B 17/0884G02B 27/026G02B 17/08G02B 2027/011
39
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Claims

Abstract

A visual display device includes an image display element 3 and an ocular optical system 5 that allows a viewer to observe an image displayed on the image display element 3 as a virtual image in a remote location. The ocular optical system 5 has at least one reflection optical element 5 a , at least one transmission optical element 5 b , and a visual axis 101 including a central main light beam in the reverse raytrace of the ocular optical system 5 which is directed from the center of an entrance pupil E toward the reflection optical element 5 a through the transmission optical element 5 b . The number of times of image formation is different between in a first cross-section including the visual axis 101 and in a second cross-section which is perpendicular to the first cross-section and includes the visual axis 101.

Claims

exact text as granted — not AI-modified
1 . A visual display device comprising:
 an image display element; and   an ocular optical system that allows a viewer to observe an image displayed on the image display element as a virtual image in a remote location,   the ocular optical system including:   at least one reflection optical element;   at least one transmission optical element; and   a visual axis including a central main light beam in the reverse raytrace of the ocular optical system which is directed from the center of an entrance pupil toward the reflection optical element through the transmission optical element, wherein   the number of times of image formation is different between in a first cross-section including the visual axis and in a second cross-section which is perpendicular to the first cross-section and includes the visual axis.   
     
     
         2 . The visual display device according to  claim 1 , wherein
 the number of times of image formation is 0 in the first cross-section and 1 in the second cross-section.   
     
     
         3 . The visual display device according to  claim 1 , wherein
 the reflection optical element and the transmission optical element each have a stronger refractive index in the direction toward the second cross-section.   
     
     
         4 . The visual display device according to  claim 1 , wherein
 the reflection optical element and the transmission optical element are each rotationally symmetric with respect to one rotationally symmetrical axis.   
     
     
         5 . The visual display device according to  claim 4 , wherein
 the second cross-section includes the rotationally symmetrical axis.   
     
     
         6 . The visual display device according to  claim 5 , wherein
 the reflection optical element is eccentric with respect to the visual axis in the second cross-section.   
     
     
         7 . The visual display device according to  claim 4 , wherein
 the visual axis and the rotationally symmetrical axis are perpendicular to each other.   
     
     
         8 . The visual display device according to  claim 1 , wherein
 the reflection optical element is a cylindrical linear Fresnel reflection element.   
     
     
         9 . The visual display device according to  claim 1 , wherein
 one side and the other side of the reflection optical element with respect to the visual axis have different shapes in the second cross-section.   
     
     
         10 . The visual display device according to  claim 1 , wherein
 the transmission optical element is a curved cylindrical linear Fresnel transmission element.   
     
     
         11 . The visual display device according to  claim 1 , wherein
 one side and the other side of the transmission optical element with respect to the visual axis have different shapes in the second cross-section.   
     
     
         12 . The visual display device according to  claim 1 , wherein
 the following conditional expression (1) is satisfied:
   | Ry|<|Rx|   (1)
 
   
       where Rx is the radius of curvature of the reflection surface of the reflection optical element in the vicinity where the reflection optical element is intersected by the visual axis in the first cross-section, and Ry is the radius of curvature of the reflection surface of the reflection optical element in the vicinity where the reflection optical element is intersected by the visual axis in the second cross-section. 
     
     
         13 . The visual display device according to  claim 1 , wherein
 the following conditional expression (2) is satisfied:
   | Fy|<|Rx|   (2)
 
   
       where Fy is the focal length of the cross-section including the rotationally symmetrical axis of the transmission optical element, and Rx is the radius of curvature of the reflection surface of the reflection optical element in the vicinity where the reflection optical element is intersected by the visual axis in the first cross-section. 
     
     
         14 . The visual display device according to  claim 1 , comprising at least two transmission optical elements. 
     
     
         15 . The visual display device according to  claim 14 , wherein
 the at least two transmission optical elements each have a rotationally symmetric surface with the same rotationally symmetrical axis as that of the reflection surface.   
     
     
         16 . The visual display device according to  claim 14 , wherein
 the at least two transmission optical elements are disposed symmetric with respect to the second cross-section.   
     
     
         17 . The visual display device according to  claim 14 , wherein
 one of the transmission optical elements has the same rotationally symmetrical axis as that of the reflection surface, and the other one thereof is disposed symmetric with respect to the second cross-section.   
     
     
         18 . The visual display device according to  claim 4 , further comprising:
 a projection optical system that projects an image displayed on the image display element; and   a diffusion surface disposed in the vicinity of the image projected by the projection optical system, wherein   a projection image projected by the projection optical system is concentrically disposed with respect to the rotationally symmetrical axis.   
     
     
         19 . The visual display device according to  claim 18 , wherein
 the projection optical system is rotationally symmetric with respect to the rotationally symmetrical axis.   
     
     
         20 . The visual display device according to  claim 4 , wherein
 the image display element has a curved surface rotationally symmetric with respect to the rotationally symmetrical axis.

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